Loading... Please wait...CP2002DBW - Double Bag, Complete System for Water Based Machine Coolants. Full System, Double Bag Unit including pump, motor, frame, castors etc. Two bags greatly increase the time between filter changes over a bag and cartridge combination. You still remove well over 95% of all particulate matter down to 1 micron. The bags can be emptied and reused. Typically extends machine coolant life to one year.